复合袋热封故障频发是何原因？为了更好的方便大家解决济南复合袋此类问题，小编在这里为您分析一番：

What is the reason for the frequent failure of composite bag heat seal? In order to better facilitate you to solve the problems of Jinan composite bags, Xiao Bian is here to analyze for you:

要达到理想的热封强度，热封压力必不可少。

To achieve the ideal heat seal strength, the heat seal pressure is indispensable.

对于轻薄包装袋、热封压力少要达到2kg/cm2，而且随着复合膜总厚度的增加而相应提高；若热封压力不足，两层薄膜之间难以达到真正的熔合，导致局部热封不好或难以夹在焊缝中间的气泡，造成虚焊。

For light and thin packaging bags, the heat sealing pressure should reach at least 2kg/cm2, and it will increase with the increase of the total thickness of the composite film; If the heat seal pressure is insufficient, it is difficult to achieve true fusion between the two layers of film, resulting in poor local heat seal or difficult to eliminate bubbles sandwiched in the middle of the weld, resulting in faulty welding.

但热封压力并非越大越好，应以不损伤焊边为宜，因为在较高的热封温度时，焊边的热封材料已处于半熔融状态，太大的压力易挤走部分热封料，使焊缝边缘形成半切断状态。焊缝发脆，热封强度降低。所以压力的调节非常关键。

However, the higher the heat sealing pressure is, the better. It is better not to damage the weld edge, because at a higher heat sealing temperature, the heat sealing material of the weld edge is already in a semi-molten state, and too much pressure is easy to squeeze out part of the heat sealing material, making the weld edge form a semi-cut state. The weld is brittle and the heat sealing strength is reduced. So the adjustment of pressure is very important.

热封时间主要由制袋机的速度决定。

The heat sealing time is mainly determined by the speed of the bag making machine.

速度快，热封时间就短；速度慢，热封时间就长。热封时间也是影响焊缝封合强度和外观的一个关键因素。相同的热封温度和压力下，热封时间长，则热封层熔合更充分，结合更牢固；但热封时间太长，容易造成焊缝起皱变形，影响平整度和外观。

Fast speed, short heat sealing time; Slow speed, long heat sealing time. The heat sealing time is also a key factor affecting the sealing strength and appearance of the weld. At the same heat sealing temperature and pressure, if the heat sealing time is long, the heat sealing layer will fuse more fully and combine more firmly; However, if the heat sealing time is too long, it is easy to cause wrinkling and deformation of the weld and affect the flatness and appearance.

热封后的焊缝若冷却不好，不但会影响焊疑的外观平整度，而且对热封强度有一定的影响，冷却过程就是通过在一定的压力下，用较低的温度对刚熔融热封后的焊缝进行定形。因此，压力不够，冷却和循环不畅，循环量不够，水温太高或冷却不及时，都会致使冷却不良，热封强度降低。

If the welding seam after heat sealing is not cooled well, it will not only affect the appearance flatness of the welding suspect, but also have a certain impact on the heat sealing strength. The cooling process is to shape the welding seam just after heat sealing at a lower temperature under a certain pressure. Therefore, insufficient pressure, poor cooling and circulation, insufficient circulation, too high water temperature or untimely cooling will lead to poor cooling and reduced heat seal strength.

复合袋内容物的影响。

The impact of the contents of the composite bag.

有些产品为粉末装，在进行灌装时易沾污封口。例如，当采用LDPE材料作为内层料时，发现封口处易破裂。这是因为LDPE对夹杂物的热封性就不是很好，这时就要更换内层膜材料或增加材料的厚度就可以提高热封强度。

Some products are powder packed, which is easy to stain and seal when filling. For example, when LDPE material is used as the inner layer material, it is found that the seal is easy to crack. This is because LDPE is not very good at heat sealing of inclusions. At this time, it is necessary to replace the inner film material or increase the thickness of the material to improve the heat sealing strength.

复合材料添加剂的影响。

Effect of composite additives.

在复合聚乙烯薄膜过程中，聚乙烯经热压辊挤压后有析出的现象，一层白白的象碎粉白状，这种现象是聚乙烯在生产过程中，加入一定量的润滑剂，是一些低熔点的蜡，容易析出薄膜表面。这层低熔点的蜡析出后直接的危害就是大大地削弱了复合强度，也大大地减弱了热封强度，特别在封边位置，造成易开口、离层。

In the process of composite polyethylene film, the polyethylene will precipitate after being extruded by the hot pressing roller, a layer of white is like broken powder. This phenomenon is that a certain amount of lubricant is added to the polyethylene during the production process, which is some low melting point wax, which is easy to precipitate to the film surface. The direct harm of this layer of low melting point wax after precipitation is that it greatly weakens the composite strength and also greatly weakens the heat sealing strength, especially at the edge sealing position, causing easy opening and delamination.

解决方法：

resolvent:

1)重新对聚乙烯进行预处理，达到理想的表面张力；

1) The polyethylene is pretreated again to achieve ideal surface tension;

2)选择合适的胶粘剂，以增强其复合牢度；

2) Select appropriate adhesive to enhance its composite fastness;

3)减低熟化温度尽量不使物质析出，从而增加复合牢度与热封强度。

3) Reduce the curing temperature and try not to precipitate substances, so as to increase the composite fastness and heat sealing strength.

复合袋热封故障频发是何原因？以上就是问题的相关解答了，希望能够帮助到您，您还有什么有关产品的问题或者需求，随时都能来我们网站//www.haaimobile.com做了解！

What is the reason for the frequent failure of composite bag heat seal? The above is the relevant answer to the question. I hope it can help you. If you have any questions or needs about the product, please come to our website at any time //www.haaimobile.com Get to know!